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//===- ARCRuntimeEntryPoints.h - ObjC ARC Optimization ----------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
/// \file
/// This file contains a class ARCRuntimeEntryPoints for use in
/// creating/managing references to entry points to the arc objective c runtime.
///
/// WARNING: This file knows about certain library functions. It recognizes them
/// by name, and hardwires knowledge of their semantics.
///
/// WARNING: This file knows about how certain Objective-C library functions are
/// used. Naive LLVM IR transformations which would otherwise be
/// behavior-preserving may break these assumptions.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TRANSFORMS_OBJCARC_ARCRUNTIMEENTRYPOINTS_H
#define LLVM_LIB_TRANSFORMS_OBJCARC_ARCRUNTIMEENTRYPOINTS_H
#include "llvm/IR/Attributes.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/Support/ErrorHandling.h"
#include <cassert>
namespace llvm {
class Function;
class Module;
namespace objcarc {
enum class ARCRuntimeEntryPointKind {
AutoreleaseRV,
Release,
Retain,
RetainBlock,
Autorelease,
StoreStrong,
RetainRV,
ClaimRV,
RetainAutorelease,
RetainAutoreleaseRV,
};
/// Declarations for ObjC runtime functions and constants. These are initialized
/// lazily to avoid cluttering up the Module with unused declarations.
class ARCRuntimeEntryPoints {
public:
ARCRuntimeEntryPoints() = default;
void init(Module *M) {
TheModule = M;
AutoreleaseRV = nullptr;
Release = nullptr;
Retain = nullptr;
RetainBlock = nullptr;
Autorelease = nullptr;
StoreStrong = nullptr;
RetainRV = nullptr;
ClaimRV = nullptr;
RetainAutorelease = nullptr;
RetainAutoreleaseRV = nullptr;
}
Function *get(ARCRuntimeEntryPointKind kind) {
assert(TheModule != nullptr && "Not initialized.");
switch (kind) {
case ARCRuntimeEntryPointKind::AutoreleaseRV:
return getIntrinsicEntryPoint(AutoreleaseRV,
Intrinsic::objc_autoreleaseReturnValue);
case ARCRuntimeEntryPointKind::Release:
return getIntrinsicEntryPoint(Release, Intrinsic::objc_release);
case ARCRuntimeEntryPointKind::Retain:
return getIntrinsicEntryPoint(Retain, Intrinsic::objc_retain);
case ARCRuntimeEntryPointKind::RetainBlock:
return getIntrinsicEntryPoint(RetainBlock, Intrinsic::objc_retainBlock);
case ARCRuntimeEntryPointKind::Autorelease:
return getIntrinsicEntryPoint(Autorelease, Intrinsic::objc_autorelease);
case ARCRuntimeEntryPointKind::StoreStrong:
return getIntrinsicEntryPoint(StoreStrong, Intrinsic::objc_storeStrong);
case ARCRuntimeEntryPointKind::RetainRV:
return getIntrinsicEntryPoint(RetainRV,
Intrinsic::objc_retainAutoreleasedReturnValue);
case ARCRuntimeEntryPointKind::ClaimRV:
return getIntrinsicEntryPoint(
ClaimRV, Intrinsic::objc_unsafeClaimAutoreleasedReturnValue);
case ARCRuntimeEntryPointKind::RetainAutorelease:
return getIntrinsicEntryPoint(RetainAutorelease,
Intrinsic::objc_retainAutorelease);
case ARCRuntimeEntryPointKind::RetainAutoreleaseRV:
return getIntrinsicEntryPoint(RetainAutoreleaseRV,
Intrinsic::objc_retainAutoreleaseReturnValue);
}
llvm_unreachable("Switch should be a covered switch.");
}
private:
/// Cached reference to the module which we will insert declarations into.
Module *TheModule = nullptr;
/// Declaration for ObjC runtime function objc_autoreleaseReturnValue.
Function *AutoreleaseRV = nullptr;
/// Declaration for ObjC runtime function objc_release.
Function *Release = nullptr;
/// Declaration for ObjC runtime function objc_retain.
Function *Retain = nullptr;
/// Declaration for ObjC runtime function objc_retainBlock.
Function *RetainBlock = nullptr;
/// Declaration for ObjC runtime function objc_autorelease.
Function *Autorelease = nullptr;
/// Declaration for objc_storeStrong().
Function *StoreStrong = nullptr;
/// Declaration for objc_retainAutoreleasedReturnValue().
Function *RetainRV = nullptr;
/// Declaration for objc_unsafeClaimAutoreleasedReturnValue().
Function *ClaimRV = nullptr;
/// Declaration for objc_retainAutorelease().
Function *RetainAutorelease = nullptr;
/// Declaration for objc_retainAutoreleaseReturnValue().
Function *RetainAutoreleaseRV = nullptr;
Function *getIntrinsicEntryPoint(Function *&Decl, Intrinsic::ID IntID) {
if (Decl)
return Decl;
return Decl = Intrinsic::getDeclaration(TheModule, IntID);
}
};
} // end namespace objcarc
} // end namespace llvm
#endif // LLVM_LIB_TRANSFORMS_OBJCARC_ARCRUNTIMEENTRYPOINTS_H
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